Damper-embedded ventilator

ABSTRACT

A damper-embedded ventilator includes a housing which has an air flow chamber formed therein and is provided with an air discharge port communicating with the air flow chamber; an impeller rotatably connected to a rotary shaft of a motor and disposed in the housing; and a back draft damper for opening and closing the air discharge port. Each component in the ventilator can be disassembled by a simple attaching/detaching operation, a user can solve problems that have occurred in each of the components or easily perform maintenance such as cleaning, merely by directly disassembling each component in the ventilator sequentially.

CROSS-REFERENCES TO THE RELATED APPLICATIONS

This application is the national phase entry of International Application No. PCT/KR2018/014669, filed on Nov. 27, 2018, which is based upon and claims priority to Chinese Patent Application No. 10-2017-0162430, filed on Nov. 30, 2017, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a damper-embedded ventilator, and more particularly, to a damper-embedded ventilator which provides a structure, by which a user can directly easily repair elements in the ventilator through an attachment/detachment method of facilitating coupling and disassembling of the elements or the ventilator can be easily maintained and repaired, for example, cleaned.

BACKGROUND

In general, a ventilation facility which compulsorily exhausts carbon dioxide, contaminated air, and bad smells accumulated in an interior space of a building, such as a house or an office building to maintain a comfortable interior environment is installed in the building.

The ventilation facility is installed to be buried mainly at an upper portion of a finishing material of a ceiling of a building, and communicates with the interiors of the building through a duct unit (for example, a flexible pipe and a diffuser).

As a conventional prior technology related to a ventilation facility, Korean Patent Application Publication No. 10-2017-0064824 (published on Jun. 12, 2017) entitled ‘Slide Assembly Type Ventilator’) is disclosed. That is, the ventilation facility is an apparatus for suctioning and exhaustion of air, air conditioning, or air purification in a building, and may be provided as an apparatus such as a conventional ventilation fan. The ventilator is used for the purpose of suctioning and discharging smoke or smells in various interiors, such as a bathroom, a toilet, a dress room, or a kitchen of a building.

In the conventional ventilator, because elements provided in the interior of the ventilator are coupled or disassembled through a bolting method or other complex coupling methods, it is very difficult for general users to individually couple and disassemble the elements. That is, in the conventional ventilator, when a problem occurs in the elements or it is necessary to maintain and repair the ventilator, for example, to clean the ventilator, there is a bothersome problem of use of having to hire an expert or solve the problem through a complex disassembling process.

Moreover, it is preferable that the conventional ventilator includes a damper for preventing backdrafts, for example, carbon dioxide, contaminated air, and bad smells exhausted. The damper generally may be installed on an exhaust passage from the outside of the ventilator as a separate part or may be attached and detached on the outside as it is very difficult to couple and disassemble the elements in the ventilator. Accordingly, in the conventional ventilator, because the damper can be disassembled from the ventilator only in a state in which a portion of a ceiling finishing material of the building, in which the ventilator is buried, is released or the ventilator itself is separated from the released ceiling finishing material when a problem occurs in the connected damper or it is necessary to maintain and repair the ventilator, for example, to clean the ventilator, there is a bothersome problem of use of having to solve the problem only through the expert.

SUMMARY

The present invention is made to solve the above-described problems, and provides a damper-embedded ventilator which can solve problems occurring in elements thereof or maintain and repair the ventilator, for example, clean the ventilator by allowing a user to directly disassemble the elements by applying an attachment/detachment structure for conveniently attaching and detaching the elements.

In particular, the present invention also provides a damper-embedded ventilator of a structure in which the backdraft prevention damper is detachably mounted in the interior of the ventilator when the backdraft prevention damper is mounted on the air discharge port of the ventilator.

The present invention also provides a damper-embedded ventilator which can prevent rotation of the backdraft prevention damper by confining a coupling location of the backdraft prevention damper mounted through a coupling groove and a coupling boas formed on a contact surface of an outer peripheral surface of the backdraft prevention damper and an inner surface of the air discharge port.

The present invention also provides a damper-embedded ventilator which can guide air sent by an impeller to smoothly discharge the air to the outside of the ventilator in a state in which noise by vortices is minimized by providing the air discharge port in a tubular shape continuously extending from a rectangular cross-sectional shape close to the air discharge form by the impeller to a circular cross-sectional shape connected to a general circular duct.

The present invention also provides a damper-embedded ventilator which can easily detachably mount an impeller to a rotary shaft of a motor in a magnetic coupling method through a magnet provided at a connection portion of the impeller and the rotary shaft of the motor.

In accordance with an aspect of the present invention, there is provided a damper-embedded ventilator including a housing defining an air flow chamber therein and provided with an air discharge port communicating with the air flow chamber, an impeller connected to a rotary shaft of a motor to be rotatable and disposed in the housing, and a backdraft prevention damper configured to open and close the air discharge port

The backdraft prevention damper may be mounted on the air discharge port to be detachable in the interior of the housing.

The backdraft prevention damper may be provided in a combined shape corresponding to an inner shape of the air discharge port to be inserted into and coupled to the air discharge port.

The damper-embedded ventilator may further include a coupling groove and a coupling boss formed on contact surfaces of an outer surface of the backdraft prevention damper and an inner surface of the air discharge port to guide coupling and disassembling directions in an attachment/detachment direction of the backdraft prevention damper and confine a coupling location of the backdraft prevention damper.

The impeller may be a sirocco fan provided in the form of a cylindrical fan and configured to blow air in a tangential direction during rotation thereof.

The air discharge port may have a tubular shape extending from a rectangular cross-sectional shape to a circular cross-sectional shape such that the air blown by the impeller is smoothly discharged.

The backdraft prevention damper may be provided in a combined outer shape corresponding to the circular cross-sectional shape of the air discharge port to be inserted into and matched with a portion having the circular cross-sectional shape.

The damper-embedded ventilator may further include an impeller attaching/detaching unit configured to couple the impeller and the rotary shaft of the motor to be detachable.

The impeller attaching/detaching unit further may include a magnet provided at a connection portion of the impeller and the rotary shaft of the motor.

In accordance with another aspect of the present invention, there is provided a damper-embedded ventilator including a housing defining an air flow chamber therein and provided with an air discharge port communicating with the air flow chamber, and an impeller connected to a rotary shaft of a motor to be rotatable and disposed in the housing, wherein as the impeller attaching/detaching unit configured to couple the impeller and the rotary shaft of the motor to be detachable, the rotary shaft of the motor includes a magnetic material magnetically coupled to a magnet and has a shaft structure, at least a portion of which is surface-mounted, the impeller includes a connection groove, into which the rotary shaft is inserted, at the center of rotation thereof, and a magnet provided inside the connection groove, the connection groove includes a hooking step for the rotational direction of the rotary shaft in a state in which the rotary shaft, a portion of which is surface-mounted, is inserted, and the hooking step is a structure that defines a gap for the rotational direction of the rotary shaft inserted into the connection groove.

The shape of a cross-section of the rotary shaft, which is perpendicular to the axial direction thereof, may have a shape in which a portion of an arc has a chamfered circular shape, and the shape of a cross-section of at least a portion of the connection groove corresponding to the rotary shaft, in which a portion of the arc may have a chamfered circular cross-section occupies only a portion of the chamfered area by a cross-section of the hooking step, and has a shape that is closer to a circle surrounding an outskirt of the rotary shaft.

The hooking step may have an inclined surface that guides insertion of the rotary shaft from an insertion direction of the rotary shaft to an inward direction of the connection groove.

According to the damper-embedded ventilator according to the present invention, because the elements in the ventilator can be disassembled through a simple attachment/detachment method, a user can solve a problem occurring in the elements or easily maintain and repair the ventilator, for example, clean the ventilator by allowing the user to sequentially disassemble only the elements in the ventilator.

Moreover, because the user can directly perform the operation without hiring an expert unlike the conventional technology, a troublesomeness of having to solve the problem through an expert or maintain and repair the ventilator, for example, clean the ventilator can be reduced, which decreases a time or costs consumed.

Further, because the backdraft prevention damper mounted on the air discharge port of the ventilator is detachably mounted in the interior of the ventilator unlike the existing one, the backdraft prevention damper can be easily mounted even after the ventilator is installed at an upper portion of the ceiling finishing material. That is, because the backdraft prevention damper also can be disassembled in the interior of the ventilator, the user can directly easily perform the above-described operation when a problem occurs in the backdraft prevention damper or it is necessary to maintain and repair the ventilator, for example, clean the ventilator.

Moreover, because a coupling location of the backdraft prevention damper mounted through the coupling groove and the coupling boss formed on the contacting surface of the outer surface of the backdraft prevention damper and the inner surface of the air discharge port is confined, rotation of the backdraft prevention damper is prevented such that the air discharge port is always opened and closed in the same form, whereby carbon dioxide, contaminated air, bad smells, and the like accumulated in the interior space of the building can be efficiently discharged to the outside.

Further, because the air discharge port is provided in a tubular shape extending from a rectangular cross-sectional shape to a circular cross-sectional shape, it can guide the air sent by the impeller, that is, carbon dioxide, contaminated air, bad smells, and the like accumulated in the interior space of the building such that the air does not collide with the inner wall of the ventilator, thereby smoothly exhausting the air to the outside of the ventilator. That is, the air discharge port is provided with the above-described hydrodynamic structure and can further enhance exhaustion efficiency.

Moreover, the impeller can be detachably mounted to the rotary shaft of the motor in a magnetic coupling method through the magnet provided at a connection portion of the impeller and the rotary shaft of the motor. That is, because the impeller also can be disassembled in the interior of the ventilator, the user can directly easily perform the above-described operation when a problem occurs in the impeller or it is necessary to maintain and repair the ventilator, for example, clean the ventilator.

Moreover, because a hooking step inside the connection groove of the impeller rotated through the rotation of the rotary shaft of the motor occupies only a portion of the surface-mounting area of the surface-mounted rotary shaft or the hooking step has an oblique surface with respect to the insertion direction of the rotary shaft, the impeller can be more easily coupled to the rotary shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a view illustrating an entire state of a damper-embedded ventilator according to the present invention;

FIG. 2 shows an exploded view illustrating a state of FIG. 1;

FIG. 3 shows a view illustrating a cross-sectional state, taken along A-A of FIG. 1;

FIG. 4 shows an exploded view illustrating a state of FIG. 3;

FIG. 5 shows a view illustrating an embodiment of a coupling structure of an air discharge port and a backdraft prevention damper;

FIG. 6 shows a cross-sectional view illustrating a coupling structure of a rotary shaft of a motor and a connection groove; and

FIG. 7 shows a cross-sectional view illustrating the shape of a hooking step in the interior of the connection groove.

Reference numbers in the drawings are: 100: damper-embedded ventilator 110: housing 111: air flow chamber 113: introduction hole 115: air discharge port 115a: coupling groove 120: motor 121: rotary shaft 130: impeller 131: connection groove 132: hooking step 150: backdraft prevention damper 151a: coupling boss 160: panel part 170: magnet 190: cover

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

All the terms of the specification are the same as the general meanings of the terms, which are understood by an ordinary person in the art to which the present invention pertains, and if the terms used in the specification do not agree with the general meanings of the terms, their meanings follows the definitions used in the specification.

Meanwhile, the configurations or systems of the apparatus, which will be described below, are provided only to describe the embodiments of the present invention and are provided not to define the scope of the present invention, and the reference numerals, which are used over the specification, denote the same elements.

A damper-embedded ventilator 100 according to the present invention includes: a housing 110 defining an air flow chamber 111 therein and provided with an air discharge port 115 communicating with the air flow chamber 111; an impeller 130 connected to a rotary shaft 121 of a motor 120 to be rotatable and disposed in the housing 110; and a backdraft prevention damper 150 configured to open and close the air discharge port.

As illustrated in FIGS. 1 to 4, the housing 110 may be provided in the form of a box that defines an interior space. In detail, the housing 110 is provided with an introduction hole 113 that is opened toward the interior of a building, and is provided with an air discharge port 115 that is opened toward the exterior of the building.

Here, as illustrated in FIGS. 3 and 4, the housing 110 defines an air flow chamber 111 in the above-described interior space. The inside of the air flow chamber 111 generally has a cylindrical shape, and is provided with the impeller 130, which will be described below, in the interior thereof. In this way, a backpressure, by which air generated while the provided impeller 130 rotates is compressed, is generated in the air flow chamber 111. Carbon dioxide, contaminated air, bad smells, and the like (hereinafter, ‘contaminated air’) accumulated in the interior space of a building, which is suctioned into the air flow chamber 111 by the impeller 130 flow to the air discharge port 115, which will be described below, and are exhausted while being guided by an inner surface of the air flow chamber 111 through a backpressure.

The introduction hole 113 may be provided at a lower portion of the housing 110 and be provided in various cross-sectional shapes, such as a circular shape, a rectangular shape, or a polygonal shape, but is provided in a rectangular cross-sectional shape in the present invention. The introduction hole 113 functions not only as a passage, through which the above-described elements are introduced into and extracted from the interior space of the housing 110, and but also as an inlet, through which the contaminated air is introduced into the above-described air flow chamber 111.

The air discharge port 115 may be provided on a side surface of the housing 110 and be provided in various cross-sectional shapes, such as a circular shape, a rectangular shape, or a polygonal shape, but is provided in a rectangular cross-sectional shape in the present invention. The air discharge port 115 functions as a passage, through which the contaminated air suctioned into the above-described air flow chamber 111 is exhausted to the outside of the housing 110.

Here, it has been described that the air discharge port 115 is provided in a rectangular cross-sectional shape, but in order to define a shape corresponding to the cross-sectional shape of a duct or a flexible pipe coupled thereto, as illustrated in FIGS. 1 to 5, a structure obtained by changing the rectangular cross-sectional shape to a circular cross-sectional shape may be formed. In detail, unlike a structure of the air discharge port 115 (a structure in which an inner wall that blocks a portion of the cross-sectional shape of a rectangular shape has a circular cross-sectional shape) of the air discharge port 115 provided in an existing ventilator, the structure of the air discharge port 115 may be a tubular hydrodynamic structure that obliquely extends from a rectangular cross-sectional shape to a circular cross-sectional shape not to block a portion of the rectangular cross-sectional shape.

Accordingly, the air discharge port 115 guides the contaminated air suctioned into the air flow chamber 111 from the rectangular cross-sectional shape to the circular cross-sectional shape to exhaust the contaminated air. That is, unlike in the existing air discharge port, because an inner wall that blocks a portion of the rectangular cross-sectional shape is not defined in the air discharge port 115, an effect of completely preventing noise, vortices, or the like generated while the contaminated air collides with the inner wall from appearing can be provided. Moreover, because the air discharge port 115 does not reduce the backpressure of the contaminated air exhausted through the air discharge port 115 due to the above-described structure, an effect of allowing the contaminated air to maintain the backpressure that can sufficiently push a blocking plate of the backdraft prevention damper 150, which will be described below, can be provided.

For example, the air discharge port 115 may protrude from a side surface of the housing 110 to be integrally formed, and may be provided with a member having a separate tubular shape to be detachably mounted as in the embodiment.

Meanwhile, as illustrated in FIGS. 1 to 4, the housing 110 may be provided with a panel part 160 that divides the interior space. The panel part 160 has a plate-shaped structure in which a hole-shaped air inlet port 161 is formed therein as illustrated in FIG. 2, and in order to compress the air generated by the impeller 130 provided in the above-described air flow chamber 111, which will be described below, the air flow chamber 111 may be provided in the interior of the housing 110 in a state in which a lower portion of the air flow chamber 111 is blocked as illustrated in FIG. 3. For example, the panel part 160 may be formed in an integral shape protruding from an inner surface of the housing 110, and may be provided as a member having a separate plate shape to be mounted in the interior of the housing 110 to be detachable.

Here, when the panel part 160 is provided as a separate member as described above, various attachment methods such as a bolting method, a coupling method, or a magnetic coupling method to detachably mount the panel part 160 in the interior of the housing 110, but according to the present invention, the panel part 160 may be easily mounted in the interior of the housing 110 by using a magnetic coupling method. In more detail, because a magnet 170 is provided at a connection portion of the panel part 160 and a portion of the inner surface of the housing 110, the panel part 160 may be magnetically coupled to the interior of the housing 110.

Accordingly, the panel part 160 may be mounted to be attached to or detached from the interior of the housing 110. That is, the panel part 160 may be not only mounted on but also dissembled from the interior of the housing 110.

Accordingly, because the user can easily perform the above-described operation by directly disassembling the panel part 160 from the interior of the housing 110 when the panel part 160 directly causes a problem or it is necessary to maintain and repair the panel part 160, for example, to clean the panel part 160, a bothersome of having to solve the problem through an expert unlike the existing method can be reduced, and thus it is convenient to use the panel part 160 and a time or costs consumed in the existing method can be efficiently reduced.

The impeller 130 may be provided in the form of a cylindrical fan as illustrated in FIGS. 2 to 4, and preferably may be a sirocco fan.

As illustrated in FIG. 3, the impeller 130 may have a connection groove 131 recessed at the inner center thereof. The rotary shaft 121 of the motor 120 provided in the housing 110 may be inserted into the connection groove 131 to be connected to the connection groove 131. A detailed configuration example of the connection groove 131 and the rotary shaft 121 will be described later in detail.

Accordingly, the impeller 130 may be connected to the rotary shaft 121 of the motor 120 to be rotatable, and may be disposed in the air flow chamber 111 of the housing 110, in which the rotary shaft 121 of the motor 120 is disposed. That is, the impeller 130 is rotated in conjunction with a driving force of the motor 120, and blows air, in the tangential direction, that is, toward the inner surface of the air flow chamber 111 during the rotation.

Meanwhile, an impeller 130 attaching/detaching unit may be further provided to detachably couple the impeller 130 to the rotary shaft 121 of the motor 120.

The impeller 130 attaching/detaching unit may use various attachment/detachment methods such as a bolting method, a coupling method, or a magnetic coupling method, but according to the present invention, the impeller 130 may be easily coupled to the rotary shaft 121 of the motor 120 by using the magnetic coupling method. In more detail, a magnet 170 is provided at a connection portion of the impeller 130 and the rotary shaft 121 of the motor 120 to magnetically couple the impeller 130 to the rotary shaft 121 of the motor 120. Then, the magnet 170 may be provided in the impeller 130 and the rotary shaft 121 itself may constitute the magnet 170 having magnetism, but preferably, as illustrated in FIG. 3, may be provided in a space separately provided at a lower portion of the connection groove 131 of the impeller 130.

Accordingly, the impeller 130 may be coupled to be attached to or detached from the interior of the housing 110 by the impeller 130 attaching/detaching unit using the magnetic coupling method. That is, the impeller 130 may be not only coupled to the rotary shaft 121 of the motor 120 but also dissembled from the interior of the housing 110.

Accordingly, because the user can easily perform the above-described operation by directly disassembling the impeller 130 from the interior of the housing 110 when the impeller 130 directly causes a problem or it is necessary to maintain and repair the impeller 130, for example, to clean the impeller 130, a bothersome of having to solve the problem through an expert unlike the existing method can be reduced, and thus it is convenient to use the impeller 130 and a time or costs consumed in the existing method can be efficiently reduced.

Moreover, as illustrated in FIGS. 6 and 7, for an operation of easily coupling the rotary shaft 121 of the motor 120 and the impeller 130 connection groove 131, the rotary shaft 121 and the connection groove 131 may have unique structures.

That is, in order to rotate the impeller 130 together in the rotational direction of the rotary shaft 121, as generally known, the rotary shaft 121 may have a shape, of which a portion of the outer surface of the cylindrical shape is surface-mounted and the connection groove 131, into which the rotary shaft 121 is inserted, may have a hole shape combined with the surface-mounted shape, and then, when the cross-sectional shape of the interior of the connection groove 131 has the same as the cross-sectional shape of the rotary shaft 121, it may become difficult to perform an operation of inserting the rotary shaft 121 into the connection groove 131.

In order to solve the problem, it is preferable that the hooking step 131 in the interior of the connection groove 131 does not occupy the entire surface-mounted area but occupies only a portion of the surface-mounted area as illustrated in FIG. 6. That is, as illustrated, when the surface-mounted area of the rotary shaft 121 has a semicircular shape, the cross-sectional shape of the hooking step 132 may have a fan-shaped cross-section having an inner angle of 90° instead of the same semicircular shape.

Due to the shape of the hooking step 132, the rotary shaft 121 may be easily coupled to the connection groove 131 even when the rotary shaft 121 is inserted while having a schematic angle.

In addition, as illustrated in FIG. 7, the hooking step 132 may include an oblique surface that is inclined from an insertion direction of the rotary shaft 121 toward the inner side of the connection groove 131, and may function to guide the rotary shaft 121 to a location that is suitable for insertion by the structure.

The backdraft prevention damper 150 is an element that opens and closes the air discharge port 115 according to whether the blocking plate mounted on and provided in the air discharge port 115 is opened or closed. The backdraft prevention damper 150 may be provided in an outer shape corresponding to the inner shape of the air discharge port 115 to mount the air discharge port 115 in the interior of the housing 110. In detail, the backdraft prevention damper 150 may be provided in a combined outer shape corresponding to the circular cross-sectional shape of the air discharge port 115, that is, in a circular cross-sectional shape.

Accordingly, the backdraft prevention damper 150 may be fitted with and matched with the air discharge port 115. That is, the backdraft prevention damper 150 may be not only coupled to the air discharge port 115 but also dissembled from the air discharge port 115 in the interior of the housing 110.

Accordingly, because the user can easily perform the above-described operation by directly disassembling the backdraft prevention damper 150 from the interior of the housing 110 when the backdraft prevention damper 150 directly causes a problem or it is necessary to maintain and repair the backdraft prevention damper 150, for example, to clean the backdraft prevention damper 150, a bothersome of having to solve the problem through an expert unlike the existing method can be reduced, and thus it is convenient to use the backdraft prevention damper 150 and a time or costs consumed in the existing method can be efficiently reduced.

Further, as illustrated in FIGS. 2 to 5, the backdraft prevention damper 150 may further include a handle 151 protruding toward the inward direction of the housing 110. The handle 151 may be provided in various shapes that may be gripped by a user, and in the present invention, may be formed in the illustrated plate shape.

Accordingly, the user can grip the handle 151 protruding from the backdraft prevention damper 150 and attach or detach the backdraft prevention damper 150 to or from the air discharge port 115 in the interior of the housing 110.

Accordingly, even though the backdraft prevention damper 150 is matched with the air discharge port 115 as described above, the user can grip the handle 151 and easily attach or detach the backdraft prevention damper 150, which is convenient for use.

Meanwhile, as described above, a coupling groove 115 a and a coupling boss 151 a formed on a contacting surface of an outer surface of the backdraft prevention damper 150 and an inner surface of the air discharge port 115 to guide a coupling/disassembling direction to an attachment/detachment direction in which the backdraft prevention damper 150 is coupled to the air discharge port 115 and confine the coupling location of the coupled backdraft prevention damper 150.

The coupling groove 115 a may be provided on the outer surface of the backdraft prevention damper 150 or on the inner surface of the air discharge port 115. The coupling groove 115 a may be formed in a groove shape that is recessed along the attachment/detachment direction of the backdraft prevention damper 150, and a plurality of coupling grooves 115 a may be provided according to occasions. In the present invention, the coupling groove 115 a may be formed on the inner surface of the air discharge port 115. That is, when the coupling boss 151 a, which will be described below, is inserted into or separated from the coupling groove 115 a, which will be described below, the coupling groove 115 a may guide the coupling boss 151 a along the lengthwise direction, that is, the attachment/detachment direction of the backdraft prevention damper 150.

The coupling boss 151 a may be provided on the outer surface of the backdraft prevention damper 150 or on the inner surface of the air discharge port 115 corresponding to the coupling groove 115 a. The coupling boss 151 a may be formed in a boss shape that protrudes along the attachment/detachment direction of the backdraft prevention damper 150, and the number of the coupling bosses 151 a may correspond to the number of the plurality of coupling grooves 115 a and may be provided according to occasions. In the present invention, the coupling boss 151 a may be formed on the outer surface of the backdraft prevention damper 150. That is, when the coupling boss 151 a may be inserted into or separated from the above-described coupling recess 115 a, the coupling boss 151 a may guide the coupling groove 115 a along the lengthwise direction, that is, the attachment/detachment direction of the backdraft prevention damper 150.

Accordingly, when the backdraft prevention damper 150 is attached to or detached from the air discharge port 115 in the interior of the housing 110, it may be guided in a coupling/disassembling direction along the attachment/detachment direction by the above-described coupling structure of the coupling groove 115 a and the coupling boss 151 a. Accordingly, when the backdraft prevention damper 150 is coupled to the air discharge port 115 in the interior of the housing 110, it can be prevented from being rotated by the above-described coupling structure of the coupling groove 115 a and the coupling boss 151 a as the backdraft prevention damper 150 and the air discharge port 115 are hooked by each other.

Accordingly, the backdraft prevention damper 150 may be easily coupled to the air discharge port 115 in the interior of the housing 110 or may be easily disassembled from the air discharge port 115, which is convenient for use. Further, because the backdraft prevention damper 150 always opens and closes the air discharge port 115 in the same form as the backdraft prevention damper 150 is prevented from being rotated, by the coupling structure of the coupling groove 115 a and the coupling boss 151 a, the contaminated air can be efficiently discharge to the outside of the ventilator.

Moreover, the damper-embedded ventilator 100 according to the present invention may further include a cover part 190. The cover part 190 may be formed in a plate shape having an area corresponding to the introduction hole 113 of the housing 110, and is provided outside of the housing 110 while blocking the introduction hole 113 of the housing 110 to prevent foreign substances introduced into the housing 110 together with contaminated air from dropping into a building. Then, it is preferable that the cover part 190 is disposed to be spaced apart from the introduction hole 113 of the housing 110 at a specific interval, which defines a space by which the contaminated air may be introduced into the introduction hole 113 of the housing 110.

Here, the cover part 190 may use various attachment/detachment methods, such as a bolting method, a coupling method, or a magnetic coupling method, to be detachably mounted on the outside of the housing 110, but in the present invention, may be easily mounted on the outside of the housing 110 by using the magnetic coupling method. In more detail, because a magnet 170 is provided at a connection portion of the cover part 190 and a portion of the outer surface of the housing 110, the cover part 190 may be magnetically coupled to the exterior of the housing 110.

Accordingly, the cover part 190 may be detachably mounted outside the housing 110. That is, the cover part 190 may be not only mounted but also dissembled outside the housing 110.

Accordingly, when a problem occurs in the cover part 190 itself or it is necessary to maintain and repair the cover part 190, that is, to clean the cover part 190, the user can easily perform the above-described operation by disassembling the cover part 190 from the outside of the housing 110, which is convenient for use.

For example, it has been described that the user directly performs the above-described operation when the configurations provided in the housing 110 encounter a problem or it is necessary to clean the damper-embedded ventilator 100 according to the present invention, and the attachment/detachment processes of the elements may be briefly described as follows.

Further, the user can disassemble the cover 170 from the outside of the housing 110. Then, because the cover 170 is detachably mounted on a portion of the outer surface of the housing 110 through a magnetic coupling method, it can be very easily disassembled by the user.

Next, the user can disassemble the panel part 160 from the interior of the housing 110. Then, because the panel part 160 is detachably mounted on a portion of the inner surface of the housing 110 through a magnetic coupling method, it can be very easily disassembled by the user.

Next, the user can disassemble the impeller 130 from the interior of the housing 110. Then, because the impeller 130 is detachably mounted on the rotary shaft 121 of the motor 120 through a magnetic coupling method, it can be very easily disassembled by the user.

Next, the user can disassemble the backdraft prevention damper 150 from the interior of the housing 110. Then, because the backdraft prevention damper 150 is detachably mounted through a press-fitting method while defining a combined outer shape in the air discharge port 115, it can be very easily disassembled by the user.

In this way, because the user may extract the elements, which have been described in the sequence, through the introduction hole 113 of the housing 110 by sequentially disassembling the element, the elements having a problem can be directly repaired or replace, and the ventilator can be maintained and repaired, that is, cleaned. To the contrary, the user can sequentially couple the elements again in the reverse sequence.

In the damper-embedded ventilator 100 according to the present invention, because the above operation can be directly performed without hiring an expert unlike the existing one, a troublesomeness of having to solve the problems through an expert or maintain and repair, that is, clean the ventilator 100 can be reduced, and thus a time or costs consumed can be reduced. 

What is claimed is:
 1. A damper-embedded ventilator comprising: a housing defining an air flow chamber therein and the housing is provided with an air discharge port communicating with the air flow chamber; an impeller connected to a rotary shaft of a motor to be rotatable and disposed in the housing; and a backdraft prevention damper configured to open and close the air discharge port, wherein, the backdraft prevention damper is detachably mounted on the air discharge port in an interior of the housing.
 2. The damper-embedded ventilator according to claim 1, wherein the backdraft prevention damper is provided in a combined shape corresponding to an inner shape of the air discharge port to be inserted into and coupled to the air discharge port.
 3. The damper-embedded ventilator according to claim 2, further comprising: a coupling groove and a coupling boss formed on a plurality of contact surfaces of an outer surface of the backdraft prevention damper and an inner surface of the air discharge port to guide a coupling direction and a disassembling direction in an attachment direction or a detachment direction of the backdraft prevention damper and confine a coupling location of the backdraft prevention damper.
 4. The damper-embedded ventilator according to claim 1, wherein the impeller is a sirocco fan provided in a form of a cylindrical fan and configured to blow air in a tangential direction during a rotation thereof, and the air discharge port has a tubular shape extending from a rectangular cross-sectional shape to a circular cross-sectional shape to provide the air blown by the impeller to be smoothly discharged.
 5. The damper-embedded ventilator according to claim 4, wherein the backdraft prevention damper is provided in a combined outer shape corresponding to a circular cross-sectional shape of the air discharge port to be inserted into and matched with a portion having the circular cross-sectional shape.
 6. The damper-embedded ventilator according to claim 1, further comprising: an impeller attaching unit and an impeller detaching unit configured to couple the impeller and the rotary shaft of the motor to be detachable.
 7. The damper-embedded ventilator according to claim 6, wherein the impeller attaching unit and the impeller detaching unit further comprises a magnet provided at a connection portion of the impeller and the rotary shaft of the motor.
 8. A damper-embedded ventilator comprising: a housing defining an air flow chamber therein and the housing is provided with an air discharge port communicating with the air flow chamber; and an impeller connected to a rotary shaft of a motor to be rotatable and disposed in the housing, wherein as an impeller attaching unit or an impeller detaching unit configured to couple the impeller and the rotary shaft of the motor to be detachable, the rotary shaft of the motor comprises a magnetic material magnetically coupled to a magnet and has a shaft structure, wherein at least a portion of the shaft structure is surface-mounted, the impeller comprises a connection groove, wherein the rotary shaft is inserted into the connection groove, at a center of rotation thereof, and a magnet is provided inside the connection groove, the connection groove comprises a hooking step for a rotational direction of the rotary shaft in a state wherein the rotary shaft, a portion of the rotary shaft is surface-mounted, is inserted, and the hooking step is a structure that defines a gap for the rotational direction of the rotary shaft inserted into the connection groove.
 9. The damper-embedded ventilator according to claim 8, wherein the shape of a cross-section of the rotary shaft is perpendicular to an axial direction thereof has a shape having a portion of an arc with a chamfered circular shape, and the shape of a cross-section of at least a portion of the connection groove corresponding to the rotary shaft, wherein the portion of the arc has a chamfered circular cross-section occupies only a portion of the chamfered area by a cross-section of the hooking step, and has a shape of a circle surrounding an outskirt of the rotary shaft.
 10. The damper-embedded ventilator according to claim 8, wherein the hooking step has an inclined surface and the inclined surface guides an insertion of the rotary shaft from an insertion direction of the rotary shaft to an inward direction of the connection groove.
 11. The damper-embedded ventilator according to claim 9, wherein the hooking step has an inclined surface and the inclined surface guides an insertion of the rotary shaft from an insertion direction of the rotary shaft to an inward direction of the connection groove. 